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On Sat, Jun 26, 2010 at 07:43:34AM -0400, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
>
> Index: xfstests-dev/239
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ xfstests-dev/239 2010-06-26 11:38:22.000000000 +0000
> @@ -0,0 +1,58 @@
> +#! /bin/bash
> +# FS QA Test No. 239
> +#
> +# Read from a sparse file immedialy after filling a hole to test for races
> +# in unwritten extent conversion.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2010 Red Hat, Inc. All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> +#-----------------------------------------------------------------------
> +#
> +# creator
> +owner=dchinner@xxxxxxxxxx
> +
> +seq=`basename $0`
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1 # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> + cd /
> + rm -f $TEST_DIR/tst-aio-dio-sparse-unwritten
> +}
> +
> +# get standard environment, filters and checks
> +. ./common.rc
> +. ./common.filter
> +
> +_supported_fs generic
> +_supported_os Linux
> +
> +AIO_TEST=src/aio-dio-regress/aio-dio-hole-filling-race
> +[ -x $AIO_TEST ] || _notrun "$AIO_TEST not built"
> +
> +echo "Silence is golden"
> +
> +for i in `seq 1 500`; do
> + $AIO_TEST $TEST_DIR/tst-aio-dio-hole-filling-race || break
> +done
> +
> +status=$?
> +exit
> Index: xfstests-dev/239.out
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ xfstests-dev/239.out 2010-06-26 11:38:47.000000000 +0000
> @@ -0,0 +1,2 @@
> +QA output created by 239
> +Silence is golden
> Index: xfstests-dev/group
> ===================================================================
> --- xfstests-dev.orig/group 2010-06-26 11:35:07.000000000 +0000
> +++ xfstests-dev/group 2010-06-26 11:35:18.000000000 +0000
> @@ -352,3 +352,4 @@ deprecated
> 236 auto quick metadata
> 237 auto quick acl
> 238 auto quick metadata ioctl
> +239 auto aio rw
> Index: xfstests-dev/src/aio-dio-regress/aio-dio-hole-filling-race.c
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ xfstests-dev/src/aio-dio-regress/aio-dio-hole-filling-race.c 2010-06-26 11:39:40.000000000 +0000
> @@ -0,0 +1,123 @@
> +/*
> + * Read from a sparse file immedialy after filling a hole to test for races
> + * in unwritten extent conversion.
> + *
> + * Copyright (C) 2010 Red Hat, Inc. All Rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
> + */
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +
> +#include <libaio.h>
> +
> +#define BUF_SIZE 4096
> +#define IO_PATTERN 0xab
> +
> +int main(int argc, char *argv[])
> +{
> + struct io_context *ctx = NULL;
> + struct io_event ev;
> + struct iocb iocb, *iocbs[] = { &iocb };
> + void *buf;
> + char cmp_buf[BUF_SIZE];
> + int fd, err = 0;
> +
> + fd = open(argv[1], O_DIRECT | O_CREAT | O_TRUNC | O_RDWR, 0600);
> + if (fd == -1) {
> + perror("open");
> + return 1;
> + }
> +
> + err = posix_memalign(&buf, BUF_SIZE, BUF_SIZE);
> + if (err) {
> + fprintf(stderr, "error %s during %s\n",
> + strerror(-err),
> + "posix_memalign");
> + return 1;
> + }
> + memset(buf, IO_PATTERN, BUF_SIZE);
> + memset(cmp_buf, IO_PATTERN, BUF_SIZE);
> +
> + /*
> + * Truncate to some random large file size. Just make sure
> + * it's not smaller than our I/O size.
> + */
> + if (ftruncate(fd, 1024 * 1024 * 1024) < 0) {
> + perror("ftruncate");
> + return 1;
> + }
> +
> +
> + /*
> + * Do a simple 4k write into a hole using aio.
> + */
> + err = io_setup(1, &ctx);
> + if (err) {
> + fprintf(stderr, "error %s during %s\n",
> + strerror(-err),
> + "io_setup");
> + return 1;
> + }
> +
> + io_prep_pwrite(&iocb, fd, buf, BUF_SIZE, 0);
> +
> + err = io_submit(ctx, 1, iocbs);
> + if (err != 1) {
> + fprintf(stderr, "error %s during %s\n",
> + strerror(-err),
> + "io_submit");
> + return 1;
> + }
> +
> + err = io_getevents(ctx, 1, 1, &ev, NULL);
> + if (err != 1) {
> + fprintf(stderr, "error %s during %s\n",
> + strerror(-err),
> + "io_getevents");
> + return 1;
> + }
> +
> + /*
> + * And then read it back.
> + *
> + * Using pread to keep it simple, but AIO has the same effect.
> + */
> + if (pread(fd, buf, BUF_SIZE, 0) != BUF_SIZE) {
> + perror("pread");
> + return 1;
> + }
> +
> + /*
> + * And depending on the machine we'll just get zeroes back quite
> + * often here. That's because the unwritten extent conversion
> + * hasn't finished.
> + */
> + if (memcmp(buf, cmp_buf, BUF_SIZE)) {
> + unsigned long long *ubuf = (unsigned long long *)buf;
> + int i;
> +
> + for (i = 0; i < BUF_SIZE / sizeof(unsigned long long); i++)
> + printf("%d: 0x%llx\n", i, ubuf[i]);
> + return 1;
> + }
> +
> + return 0;
> +}
>
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